Fire alarm



Sept. 9 1924.

F. P. HAIRTLEY FIRE ALARM Filed Nov. 15 1923 2 Sheen-Sheet l Sept. 9, 1924.

F. P. HARTLEY FIRE ALARM 2 Shoots-Shoot 2 Filed Nov. 1 5. 192:

Patented Sept. 9, 1 924.

. UNITED STATES FRANK P. HARTLEY, or BANGOR, MAINE.

1mm ALARM.

Application filed November 15, 1923. Serial No. 674,951.

To all whom it may concern-k Be it known that I, FRANK P. HARTLEY, a citizen of the United States, residing at Bangor, in the county of Penobscot and State of Maine, have invented certain new and useful Improvements in Fire Alarms; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertainsto make and use the same.

My invention aims to provide a simple and inexpensive, yet an efficient fire alarm which may be easily set to operate when it is heated to any desired degree within limits.

With the foregoing in View, the invention resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings.

Figure 1 is a front elevation partly broken away and in section.

Figure 2 is a rear elevation.

Figure 3 is a vertical sectional View on line 3-3 of Fig. 1.

Figure 4 is a duplicate of Fig. 1 with the exception that it illustrates a difierent position of parts.

In the drawings above briefly described, which illustrate the preferred form of my invention, the numeral 1 designates a vertically elongated back or supporting plate which is preferably formed with an opening 2 in its upper end so that it may be hung upon a hook or the like. Mounted upon the front side of the plate 1, is a spring-operated alarm mechanism 3 which includes a vibratory clapper arint carried by a rock shaft 5, a spring-driven toothed wheel 6 for vibrating said arm, a second arm 7 extending rigidly from'the shaft 5,- and a fiat s ring 8 normally contacting with the arm to prevent operation of the clapper arm 4:, said spring 8 being rigidly mounted on a tie or the like 9, included in the frame of the mechanism 3. As soon as the spring 8 is disengaged from the arm 7, as illustrated in Fig. 4, the alarm mechanism 3 will come into play to move the clapper arm 4 against a gong 10 which encases the mechanism 3 and is preferably carried by the winding shaft 11 thereof, so that rotation of the gong will rewind the spring when necessary.

I have shown a metal plate or block 12 the supporting plate 1, within the gong 10, said plate having studs 13 slidablyreceived in a vertical slot 14 in said plate 1.. Rising from the member'12, is a rigid finger 15 which extends to a point adjacent the con-u trol spring 8 of the alarm mechanism 3. Itv will be seen that when the member12 is contactingslidably with the front side of 1 static means which operates the member 12,

the spring 8 may be released, so that the device may be made to operate when heated, to difierent temperatures. In order that relative adjustments of the finger 15 and member 12 may be effected, I provide a suitable connection between them, such as the slot 16 and screw 17, and a suitable degree or temperature scale18 may be provided if desired, to assist in making adjustments.

For raising the member 12, I have shown a cam 19 carried by a shaft 20 which extends forwardly from the supporting plate 1, within the lower portionof the gong 10, the rear end of said shaft being rotatably supported by said plate 1, while its front end is similarly supported by a suitable yoke 21 whose ends are secured to said plate 1. A spiral thermostat 22 is secured at one end to the shaft 20 and has its other end anchored to the yoke 21, so that when this thermostat is heated above, a predetermined degree, it will bring the cam 19 into contact with the member 12, thus raising the latter and moving the finger 15 toward the spring 8. If this finger has been ad-" justed so that it is initially in substantial contact with the spring 8, very little movement on the part of the member 12 is necessary to trip said spring and bring the alarm mechanism 3 into play. However, if the finger, 15 has been adjusted so that an appreciable space exists between it and the above named spring 8, greater movement on the part of the cam 19 and the member 12, is necessary to operate the device. It will thus be seen that it may be set to operate when heated to any predetermined. degree, within limits.

As excellent results are obtainable from the details disclosed, they may be followed if desired, but the present showing is principaliy for illustrative purposes and within the scope of the invention as claimed, numerous minor changes may be made.

I claim:

1. A device of the class described com prising a support, a spring-actuated alarm mounted thereon and having a control member by means of which it is normally held against operation, a member slidably mounted on said support in spaced relation with said control member, a finger extend-- ing from said slidably mounted member to operate said control member, a cam mounted on said support for sliding said slidably mounted member, and a thermostat anchored to said support for turning said cam.

2. A device of the class described comprising a support, a spring-actuated alarm mounted thereon and having a control member by means of which it is normally held against operation, a member slidably mounted on said support in spaced relation to said control member, a finger extending from said member and having adjustable connection therewith to permit regulation of the device, and thermostatically-operated means in engagement with said slidably mounted member for actuating it at a predetermined time. i

In testimony whereof Ihave hereunto affiXed my signature.

FRANK P HARTLEY. 

